Olivine cathode active material for lithium secondary battery and manufacturing method thereof
AssigneesPosco Holdings Inc., Research Institute of Industrial Science & Technology
InventorsJong Il PARK, Sang Cheol NAM, Junghoon KIM
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Abstract
The olivine-type positive electrode active material for a lithium secondary battery according to the present invention comprises: rod-shaped particles having an average length of a long axis in a range from 250 nm to 350 nm and a length of a short axis in a range from 70 nm to 95 nm; and flake-shaped particles having an average length of a long diameter of a broad surface in a range from 350 nm to 450 nm and a length of a short diameter in a range from 200 nm to 250 nm, wherein a percentage of the number of the flake-shaped particles relative to the number of the rod-shaped particles is in a range from 10% to 50%.
Claims26
An olivine-type positive electrode active material for a lithium secondary battery, comprising:
- rod-shaped particles having an average length of a long axis in a range from 250 nm to 350 nm and an average length of a short axis in a range from 70 nm to 100 nm;
- and
- flake-shaped particles having an average long diameter of a broad surface in a range from 200 nm to 450 nm and an average short diameter in a range from 100 nm to 250 nm,
- wherein the percentage of the number of the flake-shaped particles relative to the total number of the rod-shaped particles and the flake-shaped particles is in a range from 1% to 50%.
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A method for preparing an olivine-type positive electrode active material for a lithium secondary battery, comprising:
- preparing a first reaction solution by dissolving an iron raw material, a phosphorus raw material, and a doping raw material in water, preparing a second reaction solution by dissolving a lithium raw material in water, and preparing an organic solvent in which a dispersant is dissolved;
- introducing the first reaction solution and the second reaction solution into a reactor containing the organic solvent dissolved with the dispersant, while stirring, to obtain an organic solution;
- heating the reactor to maintain an internal temperature in a range from 160° C. to 180° C., and performing a reaction under atmospheric pressure without sealing the reactor to obtain a precipitate;
- and
- separating and drying the precipitate, followed by calcining under a reducing atmosphere to obtain an olivine-type positive electrode active material.
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Dependencies are inferred from the claim text.